On the Pieridae fauna of Chiang Mai Province in North Thailand (Lepidoptera). Cent. ent. Stud., Misc. Pap. 134: 1-8, 21 figs. This article deals with the occurence of the pierid species in Chiang Mai Province in North Thailand. Totally 44 species are reported in the Province. Recorded species by the authors in the Chiang Mai University Campus are marked. Pieris (Artogeia) rapae L. is reported as new to Thailand. An illustrated determination key at specific level is arranged. Early stages of P. rapae and allied species are briefly described, illustrated and discussed. Larval foodplant of P. rapae is reported here for the first time.